RT Journal
A1 Kierlin L, Yan-Go F
T1 Heart rate variability and depression: Sleep-related breathing disorders as confounder?
JF Archives of General Psychiatry
JO Archives of General Psychiatry
YR 2009
FD August 1
VO 66
IS 8
SP 915
OP 917
DO 10.1001/archgenpsychiatry.2009.102
UL http://dx.doi.org/10.1001/archgenpsychiatry.2009.102
AB 
Licht et al1 discuss a relationship between depression and heart rate variability in their sample, which was also studied for the presence of other health-related variables, including heart disease and chronic medical conditions. Not specifically mentioned in their report is the presence of sleep-related breathing disorders (including sleep apnea) as a potential confounder, which is surprising given the evidence that exists linking these conditions to both diminished heart rate variability2 and depression.3